A language model is tasked with a complex project: 'Write a comprehensive market analysis report for a new electric scooter targeting urban commuters in Europe.' To manage this, the project is broken down into smaller, sequential tasks: 1) Researching target demographics, 2) Analyzing key competitors, 3) Projecting potential sales figures, and 4) Drafting the report's executive summary. In the formal framework for describing this problem-solving process, which element corresponds to the symbol $p_0$?

When using a formal notation to describe the process of breaking down a large, complex task into a series of smaller, more manageable sub-tasks, the original, undivided task is represented by the symbol ____.

Notation for Sub-Problems in Problem Decomposition

Role of Initial Problem Notation